Enable terminal event batching from ptyHost (#117268)

* fix #116468
Co-authored-by: NDaniel Imms <daimms@microsoft.com>

src/vs/platform/terminal/common/terminalDataBuffering.ts

@@ -31,17 +31,16 @@ export class TerminalDataBufferer implements IDisposable {
 			let buffer = this._terminalBufferMap.get(id);
 			if (buffer) {
 				buffer.data.push(data);
-
 				return;
 			}
 
-			const timeoutId = setTimeout(() => this._flushBuffer(id), throttleBy);
+			const timeoutId = setTimeout(() => this.flushBuffer(id), throttleBy);
 			buffer = {
 				data: [data],
 				timeoutId: timeoutId,
 				dispose: () => {
 					clearTimeout(timeoutId);
-					this._flushBuffer(id);
+					this.flushBuffer(id);
 					disposable.dispose();
 				}
 			};
@@ -57,7 +56,7 @@ export class TerminalDataBufferer implements IDisposable {
 		}
 	}
 
-	private _flushBuffer(id: number): void {
+	flushBuffer(id: number): void {
 		const buffer = this._terminalBufferMap.get(id);
 		if (buffer) {
 			this._terminalBufferMap.delete(id);

src/vs/platform/terminal/node/ptyService.ts

@@ -12,6 +12,7 @@ import { TerminalRecorder } from 'vs/platform/terminal/common/terminalRecorder';
 import { TerminalProcess } from 'vs/platform/terminal/node/terminalProcess';
 import { ISetTerminalLayoutInfoArgs, ITerminalTabLayoutInfoDto, IProcessDetails, IGetTerminalLayoutInfoArgs, IPtyHostProcessReplayEvent } from 'vs/platform/terminal/common/terminalProcess';
 import { ILogService } from 'vs/platform/log/common/log';
+import { TerminalDataBufferer } from 'vs/platform/terminal/common/terminalDataBuffering';
 
 type WorkspaceId = string;
 
@@ -224,7 +225,7 @@ export class PtyService extends Disposable implements IPtyService {
 
 export class PersistentTerminalProcess extends Disposable {
 
-	// private readonly _bufferer: TerminalDataBufferer;
+	private readonly _bufferer: TerminalDataBufferer;
 
 	private readonly _pendingCommands = new Map<number, { resolve: (data: any) => void; reject: (err: any) => void; }>();
 
@@ -282,15 +283,6 @@ export class PersistentTerminalProcess extends Disposable {
 			this.shutdown(true);
 		}, LocalReconnectConstants.ReconnectionShortGraceTime));
 
-		// TODO: Bring back bufferer
-		// this._bufferer = new TerminalDataBufferer((id, data) => {
-		// 	const ev: IPtyHostProcessDataEvent = {
-		// 		type: 'data',
-		// 		data: data
-		// 	};
-		// 	this._events.fire(ev);
-		// });
-
 		this._register(this._terminalProcess.onProcessReady(e => {
 			this._pid = e.pid;
 			this._cwd = e.cwd;
@@ -298,12 +290,14 @@ export class PersistentTerminalProcess extends Disposable {
 		}));
 		this._register(this._terminalProcess.onProcessTitleChanged(e => this._onProcessTitleChanged.fire(e)));
 		this._register(this._terminalProcess.onProcessShellTypeChanged(e => this._onProcessShellTypeChanged.fire(e)));
-		// Buffer data events to reduce the amount of messages going to the renderer
-		// this._register(this._bufferer.startBuffering(this._persistentProcessId, this._terminalProcess.onProcessData));
-		this._register(this._terminalProcess.onProcessData(e => this._recorder.recordData(e)));
-		this._register(this._terminalProcess.onProcessExit(exitCode => {
-			// this._bufferer.stopBuffering(this._persistentProcessId);
-		}));
+
+		// Data buffering to reduce the amount of messages going to the renderer
+		this._bufferer = new TerminalDataBufferer((_, data) => this._onProcessData.fire({ data: data, sync: true }));
+		this._register(this._bufferer.startBuffering(this._persistentProcessId, this._terminalProcess.onProcessData));
+		this._register(this._terminalProcess.onProcessExit(() => this._bufferer.stopBuffering(this._persistentProcessId)));
+
+		// Data recording for reconnect
+		this._register(this.onProcessData(e => this._recorder.recordData(e.data)));
 	}
 
 	attach(): void {
@@ -348,6 +342,9 @@ export class PersistentTerminalProcess extends Disposable {
 			return;
 		}
 		this._recorder.recordResize(cols, rows);
+
+		// Buffered events should flush when a resize occurs
+		this._bufferer.flushBuffer(this._persistentProcessId);
 		return this._terminalProcess.resize(cols, rows);
 	}
 	acknowledgeDataEvent(charCount: number): void {